Seat repositioning device with release on control handle

ABSTRACT

Seat repositioning systems for vehicles comprise an operator&#39;s seat having a seat bottom and optionally, a seat back, where the operator&#39;s seat further comprises an adjustable characteristic, such as seat rotation, seat height adjustment, tilt, or X-Y position. A seat release control is operable to release the operator&#39;s seat from a locked position for repositioning of the adjustable characteristic of the operator&#39;s seat.

CROSS REFERENCE TO RELATED APPLICATIONS

The present application is a continuation of U.S. Pat. No. 7,059,680,entitled “Seat Repositioning Device With Release On Control Handle”, andis related to U.S. Pat. No. 7,121,608, entitled “Rotating and/orSwiveling Seat” and U.S. patent application Ser. No. 11/539,676, adivisional of U.S. Pat. No. 7,121,608, all of which are herebyincorporated by reference.

BACKGROUND OF THE INVENTION

The present invention relates in general to working vehicles such asmaterials handling vehicles, construction vehicles and agriculturalvehicles, and more particularly to seat repositioning systems for suchvehicles.

A material handling vehicle, such as a turret stockpicker, typicallyincludes a platform having an operator's seat and a number of controlelements that are located in the vicinity of the seat within reach ofthe vehicle operator's hands and/or feet. The control elements typicallyinclude steering and traction controls for navigating the vehicle andvarious switches and levers, which are provided for operating the loadhandling features of the vehicle. For example, the traction controlelements typically include travel direction and speed controls that canbe operated in cooperation with brake pedals arranged on the platformfloor proximate to the operator's seat. Additionally, load handlingcontrol elements may be provided, such as for performing primary mastraise and lower functions and for pivoting and traversing the forks.

Depending upon the task being performed, it may be advantageous for thevehicle operator to have a field of view greater than that typicallyprovided by a fixed, forward facing seat position. For example, turretstockpickers are equipped with a swing mast that allows the orientationof the forks to be rotated by approximately 180 degrees. Thus, theturret stockpicker can travel down narrow warehouse aisles andpick/putaway stock from either side of a given aisle. At times duringsuch operations, the operator may desire to have a field of view thatincludes forward, side or rearward directions. To this end, theoperator's seat may be made to rotate to provide adjustable operatingpositions. However, an operator in a seated position must typicallyreach down beneath a seat bottom to operate a handle or lever in orderto reposition the operator's seat. The positioning of the release handleunder the operator's seat is also common for releasing/controlling theforward and backward positioning of such seats. In many applications, itcan be very difficult if not impossible to operate other controlelements such as the traction controls or load handling features whileattempting to also operate a lever or handle underneath the seat toattain a given seat position.

SUMMARY OF THE INVENTION

The present invention provides seat repositioning systems that can beeasily and quickly adjusted. The seat repositioning systems comprise aseat release control such as a switch, button or other actuation devicethat is controllable to cause an operator's seat to be released from acurrent locked position. Once unlocked, the operator's seat may berotated or otherwise relocated to a new position, whereupon theoperator's seat may be locked into its new position.

The seat release control may be placed on a control handle that isintegrated into an armrest of the operator's seat. Under thisarrangement, the vehicle operator may reposition the operator's seatwithout letting go of the control handle, which may further supporttraction controls, steering controls and/or other elements that controlthe load handling and other features of the vehicle. Still further,control systems may be provided on the vehicle that determine whetherthe operator's seat may be rotated or otherwise unlocked forrepositioning based upon predetermined operational parameters, e.g.,load handling or maneuvering features or conditions of the vehicle.Additionally, the control systems may influence one or more operationalparameters of the vehicle based at least in part, by a state of theoperator's seat, e.g., whether the operator's seat is locked orunlocked, and/or based upon the rotated position of the operator's seat.For example, the vehicle may not allow the operator's seat to beunlocked if the speed of the vehicle exceeds a predetermined velocity.As another example, the vehicle may not allow certain features, e.g.,traction and/or load handling features to be enabled if the operator isstanding and/or the seat is rotated to a predetermined range ofpositions.

According to an aspect of the present invention, a system forrepositioning an operator's seat in a vehicle comprises an operator'sseat, a rotate assembly, a release assembly and a seat release control.The operator's seat includes a base structure coupled to an operatorsupport. Further, the operator's support includes a seat bottom uponwhich a vehicle operator may sit. The rotate assembly is arranged suchthat the base structure is rotatable relative to a floor of the vehicle.The release assembly has a lock device that engages the rotate assemblyto lock the operator's seat from rotating and is electrically controlledin response to operation of the seat release control to release therotate assembly for rotation of the operator's seat by an operator.

According to another aspect of the present invention, a system forrepositioning an operator's seat in a vehicle comprises an operator'sseat, a rotate assembly, a release assembly and a seat release control.The operator's seat has a base structure coupled to an operator support.Further, the operator support includes a seat bottom upon which avehicle operator may sit. The rotate assembly is arranged such that thebase structure is rotatable relative to a floor of the vehicle. Therelease assembly is operatively configured to lock the operator's seatfrom rotating when the release assembly is in engagement with the rotateassembly and allows the operator's seat to rotate when the releaseassembly is released from engagement with the rotate assembly. The seatrelease control is provided on a control handle that provides at leastone other vehicle control function. The seat release control is operableto cause the release assembly to release the operator support forrepositioning and the control handle

According to yet another aspect of the present invention, a system forrepositioning an operator's seat in a vehicle comprises an operator'sseat having a seat bottom, a seat back and at least one armrest, wherethe operator's seat further comprises an adjustable characteristic,e.g., seat rotation, seat height adjustment, tilt, or X-Y positionrelative to a floor of the vehicle. A control handle provided on thearmrest of the operator's seat has at least one control element forcontrolling a function of the vehicle and a seat release control that isoperable to release the operator's seat from a locked position forrepositioning the adjustable characteristic of the operator's seat.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

The following description of the preferred embodiments of the presentinvention can be best understood when read in conjunction with thefollowing drawings, where like structure is indicated with likereference numerals, and in which:

FIG. 1 is a perspective view of an exemplary material handling vehicleaccording to the present invention;

FIG. 2 is a perspective view of an operator's seat for an exemplarymaterial handling vehicle according to the present invention;

FIG. 3 is a block diagram of a system for repositioning an operator'sseat of a materials handling vehicle;

FIG. 4 is a block diagram of a system for repositioning an operator'sseat of a material handling vehicle according to another aspect of thepresent invention;

FIG. 5 is a perspective view of a control element on a seat handle ofthe operator's seat shown in FIG. 2;

FIG. 6 is a perspective view of an electromechanical device forcontrolling the repositioning of the operator's seat of FIG. 2;

FIG. 7 is an alternative perspective view of the device of FIG. 6;

FIG. 8 is a top perspective view of the device of FIG. 6 with a portionof the device cut away to clarify the configuration of a locking memberof the device;

FIG. 9 is a perspective view of the operator's seat of FIG. 2 where theseat bottom is folded up against the seat back of the operator's seat;

FIG. 10 is a perspective view of a sensor in the operator's seat ofFIGS. 2 and 9 for determining whether a an operator is seated in theoperator's seat; and

FIG. 11 is a perspective view of a seat release system that comprises abraking device and that allows complete 360 degree rotation of theoperator's seat.

DETAILED DESCRIPTION OF THE INVENTION

In the following description of the preferred embodiments, reference ismade to the accompanying drawings that form a part hereof, and in whichis shown by way of illustration, and not by way of limitation, specificpreferred embodiments in which the invention may be practiced. It is tobe understood that other embodiments may be utilized and that changesmay be made without departing from the spirit and scope of the presentinvention.

Referring now to the drawings, and particularly to FIG. 1, a materialshandling vehicle 10, such as a turret stockpicker, typically includes apower unit 12, an operator platform assembly 14, and a load handlingassembly 16. The power unit 12 includes a first compartment 18 forhousing a power source, such as a battery, a pair of load wheels 20positioned under the operator platform assembly 14, one or more drivewheels 22 (a pair of drive wheels 22 are shown) positioned under therear end 24 of the power unit 12, a main mast 26 on which the operatorplatform assembly 14 may be raised and lowered, and an electroniccontrol unit 28 that typically controls one or more traction motors (notshown), each traction motor corresponding to an associated drive wheel22.

The platform assembly 14 includes an operator's compartment 30 having aplatform floor 31, an operator's seat 32 and a plurality of controlelements 34 for driving the vehicle 10, controlling the features of theload handling assembly 16 and for performing other tasks related to theoperation of the vehicle 10. In FIG. 1, the control elements 34 areshown as being positioned on the armrests of the operator's seat 32.However, control elements 34 may also be positioned proximate to theoperator's seat 32 and foot actuated controls such as vehicle brake,direction and acceleration pedals can be placed on the platform floor31. Additionally, buttons, levers and other controls may be panelmounted or otherwise positioned within the operator's compartment 30,preferably within reach of an operator sitting in the operator's seat32.

The load handling assembly 16 includes a pair of lift forks 36 that maybe raised and lowered along an auxiliary mast 38. Moreover, theauxiliary mast 38 may be traversed back and forth across the front ofthe operator's compartment 30, and the lift forks 36 may be rotated inan arc of approximately 180 degrees relative to the auxiliary mast 38.

Referring to FIG. 2, the operator's seat 32 includes generally, a basestructure 46 coupled to an operator support 48 by an intermediate member50. The operator support 48 comprises a seat bottom 52, a seat back 54,and a head rest 56. The seat bottom 52 may be hingedly supported so asto be repositionable from a substantially horizontal position or seatdown position (as shown) to a substantially vertical position or seat upposition (see FIG. 9) by pivoting the seat bottom 52 in the direction ofarrow 62. In the seat down position, the seat bottom 52 provides asuitable support surface upon which the vehicle operator may sit. In theseat up position, the seat bottom 52 may be vertically adjusted toprovide a suitable support surface upon which the vehicle operator maylean when the vehicle operator is operating the vehicle in a standingposition.

The operator's seat further includes a right armrest 58 and a leftarmrest 60. The right and left armrests 58, 60 optionally pivot or areotherwise repositionable with respect to the seat bottom 52 and seatback 54. For example, the right armrest 58 may be mounted for inwardpivotal movement and the left armrest 60 may be mounted for both outwardand inward pivotal movement as indicated by the directional arrowsadjacent to each armrest 58, 60, where outward pivotal movement isdefined as being away from the seat bottom 52. The above arrangementallows the left armrest 60 to be moved out and away from the seat bottom52 for ease of ingress and egress to the operator' seat 32, e.g., whenperforming tasks such as parts picking where the operator requiresmobility within the compartment 30. Additionally, as noted above, theseat bottom 52 is mounted for vertical pivoting movement in thedirection of arrow 62 relative to the seat back 54 (between seat up anddown positions). As will be described in greater below, the height ofthe seat bottom 52 and the armrests 58, 60 may be made adjustable tofacilitate standing and seated operation of the vehicle 10 whilemaintaining easy access to the operative control elements 34 in eitherposition.

The control elements 34 are operatively configured to control designatedfunctions related to the operation of the vehicle 10 and may comprisesingle controls or the control elements 34 may be incorporated intomultifunction controls. The control elements 34 may include for example,buttons, levers, switches, joysticks, jog wheels, throttles,potentiometers, encoders and other controls. The control elements 34collectively provide the functionality necessary to navigate thevehicle, operate the load handling features of the vehicle, and/oroperate other features related to the performance of specific tasks.

For example, the control elements 34 may comprise a traction control arm64 for controlling direction of movement as well as acceleration anddeceleration of the vehicle 10, and a steering tiller 66, e.g., a fingeroperated tiller disk having a pop-out handle, for steering the vehicle10. The traction control arm 64 and the steering tiller 66 may thus beoperated in combination with brake pedals (not shown) to drive thevehicle 10. Lever controls 68, 70 may provide variable control betweenpredetermined minimum and maximum values for controlling traversing androtation of the forks 36, and/or raising and lowering the primary andauxiliary masts 26, 38. Integrated hand sensors 71 (see FIG. 5), e.g.,optical sensing elements, may be provided in the lever controls 68, 70(or any of the other control elements 34) to ensure that the operator'shands are maintained within the operator's compartment 30 duringpredetermined operations, e.g., while performing certain load handlingfunctions. Moreover, control elements 34 may be provided to operateother command and control features, such as to sound a horn or otheraudible or visual signal, to operate a fan, communications link, light,scanner technology, or provide any other desired function necessary toperform a given task.

Still further, the operator support 48 may swivel about a swivel axis 92(see FIG. 2) as set out in greater detail in U.S. Pat. No. 7,121,608,entitled “Rotating and/or Swiveling Seat”, which is incorporated byreference herein.

The intermediate member 50 includes generally, a first frame member 72that extends substantially vertically between the base structure 46 andthe operator support 48. The intermediate member 50 allows the height ofthe seat bottom 52 and seat back 54 to be adjustable as indicated bydirectional arrow 73, e.g., using a gas cylinder (not shown) toaccommodate the varying physical characteristics of anticipated vehicleoperators. The ability to adjust the height of the operator support 48,including the seat bottom 52 and armrests 58, 60 further allows theoperator to reposition the control elements on the right and leftarmrests 58, 60 to an appropriate position when operating the vehicle 10in standing or sitting positions.

The base structure 46 comprises a mounting member 74 that couples thefirst frame member 72 and a seat release system 76. The seat releasesystem 76 allows the operator's seat 32 to be rotatable (at leastpartially) about a substantially vertical axis 78 as will be explainedin greater detail below. The seat release system 76 is locatedunderneath the platform floor 31 and may be bolted or otherwise securedto a platform base 33 or other suitable structure. Thus the mountingmember 74 is generally coplanar relative to the platform floor 31.

The seat release system 76 comprises a locking arrangement that includesgenerally, a rotate assembly 80 and a release assembly 82 as shown. Therotate assembly 80 may include one or more designated locking positionssuch that when the operator's seat 32 is transitioned to a select one ofthe designated locking positions and the release assembly 82 is notactivated, the operator's seat 32 is locked into that designatedposition (best seen in FIG. 8). Correspondingly, the release assembly 82is operable to unlock the rotate assembly 80 for repositioning theoperator's seat 32 with respect to the platform floor 31. When theoperator's seat 32 is repositioned into a new one of the designatedlocking positions and the release assembly 82 is deactivated, theoperator's seat is locked into position. If the release assembly 82 isdeactivated before the operator's seat 32 is oriented with respect toone of the designated locking positions, the operator's seat 32 may lockinto the next encountered locking position. As an alternative todesignated locking positions, the rotate assembly 80 may be lockable inany continuously variable position within the range of rotation of theoperator's seat 32, an example of which is described in greater detailbelow with reference to FIG. 11.

The axis 78, defining the rotation axis for the operator's seat 32 withrespect to the platform floor 31, is positioned generally forward underthe seat bottom 52 when the seat bottom 52 is in the seat down positionas shown in FIG. 2. As such, the axis 78 is spaced radially away fromthe center of gravity anticipated by a typical operator sitting in theoperator's seat. However, as noted above, the seat release system 76 islockable into designated positions. As such, inertial forces that maytend to rotate the operator's seat 32 during operation of the vehicle 10are mitigated.

Referring to FIG. 3, a block diagram illustrates a system 102 forrepositioning the operator's seat 32 of the material handling vehicle10. The system 102 comprises a seat release element 104, e.g., which maybe implemented as any one or more control elements 34 described abovewith reference to FIGS. 1-2 including a button, lever, switch, etc. Theseat release element 104 is coupled to a module 106 that includes thenecessary logic, including hardware and/or software, to operate arelease 108 based upon the input from the seat release element 104. Assuch, an electrical coupling arrangement is realized between the seatrelease element 104 and the release 108. Alternatively, a mechanicalcoupling, e.g., cable, or other suitable linkages, may be implementedbetween the seat release element 104 and the release 108.

The release 108 interacts with a base member 110 of the operator's seat32 so as to lock and unlock the base structure 46 of the operator's seat32 for rotational movement with respect to the platform floor 31. Oneexemplary implementation of the release 108 and base member 110 areshown in FIG. 2. With brief reference thereto, the release 108 maycorrespond to the release assembly 82 and the base member 110 maycorrespond to the rotate assembly 80. Referring back to FIG. 3, theorientation of the release 108 with respect to the base member 110 maydefine at least two states. A first state defines a locked state whereinthe base member 110 is restricted from significant rotational movementwith respect to the release 108. A second state defines an unlockedstate wherein the base member 110 is rotatable with respect to therelease 108. For example, when the release 108 is in an unlocked staterelative to the base member 110, the base member 110 may be rotatedbetween two or more desired positions.

In one illustrative embodiment, such as the embodiment of FIG. 3,actuating the seat release element 104, e.g., depressing a button,instructs the module 106 to transition the release 108 from the first(locked) state to the second (released) state for as long as the seatrelease element 104 is held actuated. While in the released state,designated by the maintained actuation of the seat release element 104,the operator is free to reposition the operator's seat 32 to any of thepossible positions. Upon releasing the seat release element 104, themodule 106 communicates with the release 108 to enable transition to thefirst state wherein the base member 110 is locked into place by therelease 108. Thus, the module 106 need only comprise a communicationmedium between the release 108 and the seat release element 104.However, the module 106 may alternatively implement processing,filtering or other manipulation to convert the signal from the seatrelease element 104 into a suitable control signal for the release 108.

Referring to FIG. 4, a block diagram illustrates another exemplarysystem 150 for repositioning the operator's seat 32 of the materialhandling vehicle 10. The system 150 includes the general functionalityof the system 102 discussed with reference to FIG. 3, and furtherincludes the components necessary to implement the system 102 over anetwork environment. As such, like components are illustrated with likereference numerals.

A seat release element 104 is coupled to a first module 152. The firstmodule 152 includes the necessary logic, including hardware and/orsoftware, to communicate with the seat release element 104. When thefirst module 152 detects that the seat release element 104 has beenactuated, a message is communicated over a network 154, and is receivedby a second module 156. For example, a Controller Area Network (CAN) maybe used to form the network communications link between the first module152 and the second module 156. The CAN protocol is a convenient networkplatform for material handling vehicles as there is no addressing ofsubscribers or stations in the conventional network sense. Rather, theCAN defines a prioritized system of transmitted messages where thepriority of a given message broadcast across the CAN is dependent uponan identifier code. That is, the first module 154 broadcasts a messagethat includes an identifier, and the message to be communicated.

Each message from the first module 152 may compete for bus access withmessages generated by other modules on the CAN, and priority willtypically be determined based upon the identifier code. However, amessage broadcast from the first module 152 can be received by all nodesor modules connected to the CAN. Thus, a message broadcast by the firstmodule 152 is received by the second module 156 as well as othermodules, e.g., modules 158, 160, 162, etc., that are connected to theCAN. Each module 152, 156, 158, 160, 162 may be programmed to decide,e.g., based upon the identifier or other information encoded in thereceived message, whether that module should take action based upon thereceived messages. The network 154 may alternatively comprise any otherbus system or communications link. As such, the first module 154 maybroadcast, unicast or otherwise communicate with the second module 156.

The second module 156 includes the necessary logic, including hardwareand/or software, to operate the release 108 based upon the message(s)received from the first module 152. The interaction between the release108 and the base member 110 is substantially as described above withreference to FIG. 3. According to an embodiment of the present inventionrepresented by FIG. 4, the vehicle 10 comprises several modules, e.g.,eight or more, that are capable of putting information onto and/orreading information off of the network 154. As will be described ingreater detail below, the network 154 allows an efficient means foradding vehicle wide decision making to the seat repositioning operation.For example, certain travel, load handling features or other vehicleoperational features can be disabled/enabled or limited while anoperator is rotating the operator's seat 32.

As a first example, assume that the module 158 controls operation of theforks 36 on the vehicle 10. Further, assume that commands from thecontrol elements 34 that operate the pivoting and/or traversing of theforks 36 are transmitted across the network 154 and are received by themodule 158. The module 158 can be programmed or otherwise configured totemporarily ignore commands to perform select operations with the forks36 until the operator's seat 32 is returned to a locked or designatedposition or range of positions. Alternatively, assume that module 152transmits fork pivot and traverse commands intended for the module 158in addition to transmitting the seat release commands intended for thesecond module 156. Under this arrangement, the pivot and traversecommands may be derived from the control elements 34 on the armrests 58,60 of the operator's seat 32. The first module 152 can be programmed orotherwise configured to ignore any received commands to pivot/traversethe forks 36 from the corresponding control elements 34, or perform anyother vehicle functions for that matter, while the operator's seat 32 isunlocked, e.g., as indicated by detecting that the seat release element104 is engaged. The specific application will likely dictate the vehiclefunctions that are disabled during seat adjustment operations.

Similarly, the additional modules 160, 162, etc., can transmitadditional information to the second module 156 over the network 154,and that additional information may be used to determine whether arequest from the first module 152 to release the operator's seat 32 iseven permissible. Depending upon the implementation of the vehicle, andthe performance requirements thereof, it may be desirable to limitoperation of the seat release to when the vehicle is stationary, ortraveling at a speed that is below a predetermined threshold, e.g., 2.5miles per hour (approximately 4 kilometers per hour). As a secondexample, assume that the module 160 is coupled to a vehicle speedsensor. If the speed of the vehicle 10 exceeds a predeterminedthreshold, the module 160 can broadcast an appropriate message acrossthe network 154. If the second module 156 receives a message thatindicates that the vehicle is traveling in excess of the predeterminedspeed threshold, the second module may choose to ignore the request fromthe first module 152 to unlock the operator's seat.

Still further, because the module 160 broadcasts the vehicle speedmessage to all nodes on the network 154, the first module 152 will alsoreceive the message from module 160. As such, the first module 152 maybe configured to refuse to transmit a seat release message if the firstmodule 152 determines that vehicle 10 is traveling above thepredetermined threshold speed. The above approach of selectivelyenabling/disabling seat release and/or other operational parametersassociated with predetermined tasks can be applied as the specificapplication dictates to any number of operational parameters.

The above-described features may also be combined in numerous ways toachieve enhanced operational functionality. As a third example, assumethat the module 162 comprises a seat sensor that determines whether theoperator is seated or whether the operator is standing. There arecircumstances where an operator may prefer to operate the vehicle in astanding position. When the operator is standing however, certainvehicle operations may be disabled or reduced in functionality. Further,standing operation may be prohibited when the operator's seat is rotatedinto certain, predetermined positions. Assume that the second module 156receives a request from the first module 152 to release the operator'sseat 32. In response thereto, the module 158 may temporarily disablesome or all functionality of the forks, but only if the operator is notsitting in the operator's seat 32. Moreover, the second module 156 maynot allow the operator's seat 32 to be repositioned if the module 162indicates that the operator is not seated. Again, since all messages arebroadcast to all modules in a CAN network, each module 152, 156, 158,160, 162, etc., may make decisions or perform functions based uponinputs from any one or more of the remaining modules 152, 156, 158, 160,162, etc., on the network 154.

The above examples were presented by way of illustration and not by wayof limitation to demonstrate the broad flexibility of the presentinvention and to demonstrate exemplary approaches to integrate seatrelease commands into the control decisions of other vehicle processes.Moreover, the present invention is not limited to a prescribed number ofmodules, or to a prescribed functionality of any given module. Forexample, there can be more modules than disclosed herein. Still further,the system need not operate across a network. Any communications mediummay be implemented within the spirit of the present invention.

Referring to FIG. 5, the seat release element 104 described withreference to FIGS. 3 and 4 may be integrated into, or otherwisepositioned proximate to other control element(s) 34, e.g., a joystick,lever, button or multifunction control included on the right and/or leftarmrests 58, 60 of the operator's seat 32. In the exemplary handle ofFIG. 5, it can be seen that the palm of the operator's right hand willtypically be resting upon a textured portion of a handle 170 of ajoystick 172. The operator's right thumb is positioned to easily operatea thumb-operated control 174. The operator can reach (and actuate) theseat release element 104 by simply lifting and repositioning the rightindex finger. This can be accomplished without removing the right handfrom an operative position with respect to the joystick 172,thumb-operated control 174 and any other controls that may be present onthe handle 170. It may also be accomplished without removing the handfrom the integrated hand sensors 71.

As shown, the seat release element 104 comprises a spring loaded button.The button may be arranged such that when the button is not beingdepressed, a first logic signal is communicated to the first module 152and while a vehicle operator depresses the button, a second logic signalis communicated to the first module 152. The spring bias or otherautomatic return device on the button thus causes the signalcommunicated by the button to the first module 152 to return to thefirst logic state when released by the operator. For example, a logicsignal having a first value, e.g., a logic level “1” or +5 volt level,may indicate that the vehicle operator does not desire to release theseat for repositioning. While the operator holds the button in, thevehicle operator indicates a desire to reposition the seat bymaintaining the logic signal at a second value, e.g., a logic level “0”or signal that transitions towards the battery negative.

Because of the positioning of the seat release element 104 proximate toother control elements 34, a vehicle operator may adjust or repositionthe operator's seat 32 without interrupting the performance of a giventask. As best seen in FIG. 2, the seat release element 104 is positionedabove a horizontal plane of the armrest, which may assist the vehicleoperator in locating and/or activating the seat release element 104without significantly altering the line of sight of the vehicle operatoror without significantly modifying the posture of the vehicle operator.For example, by incorporating the seat release element 104 with othercontrol elements 34, or by placing the seat release element 104proximate to an operator's working position, i.e., in the vicinity of ahand, arm, leg, etc., the location of the seat release element 104 canbe memorized such that an operator can maintain visual focus on a firsttask while simultaneously adjusting the operator's seat 32. That is,seat dynamics can be blended or performed simultaneously with taskcontrol not related to adjustment of the operator's seat 32. In thisregard, although the adjustable characteristic of the operator's seat 32is described herein primarily with reference to the rotation of theoperator's seat 32, the seat release element 104 may further beconfigured to adjust other characteristics of the operator's seat, suchas seat height, tilt, or X-Y position relative to the platform floor 31.As such, the above-described examples of integrating seat adjustmentswith other vehicle operations and other operational tasks can besimilarly applied.

Also, as best seen in FIG. 2, the seat release element 104 comprises abutton positioned on the right armrest 58 of the operator's seat 32.However, the seat release element 104 may take on forms other than abutton. For example, the seat release element 104 may comprise a lever,switch, or any other control that may be selectively actuated orotherwise operated by a vehicle operator. Also, while illustrated asbeing integrated into a control handle such as a joystick ormultifunction control, the button may alternatively be independentlypositioned or otherwise integrated into a position that is accessibleand convenient for the vehicle operator as noted above.

Referring back to FIG. 2, the first module 152 may comprise a logicdevice that is positioned in the corresponding armrest 58, 60 of theoperator's seat 32. Thus the first module 152 may handle communicationbetween the network 154 and all of the control elements 34 including anyjoysticks, levers, switches, toggles or other control elements in thecorresponding armrest 58, 60. Correspondingly, the second module 156 maybe positioned proximate to the seat release 76, 108.

When the seat release element 104 is actuated, the change in the logiclevel derived from the seat release element 104 is detected at the firstmodule 152. The first module 152 then assembles an appropriate message,which is subsequently broadcast across the network 154. As noted above,the first module 152 may have to assign a priority, node identificationinformation, or some other type of identification, which is communicatedto the second module 156. The first module 152 may periodicallybroadcast a seat release command for as long as the operator maintainsthe operative control in an actuated state, or alternatively, the firstmodule 152 may broadcast a first message indicating that the seatrelease element 104 has been actuated, and a second message when theseat release element 104 is released to its default position.

Referring to FIGS. 6-8, the second module 156 may comprise a vehiclecontrol module (VCM), which is further responsible for performing otherfunctions related to the operation of the vehicle 10. The VCM can bepositioned in any practical position with respect to the vehicle.However, it may be convenient to position the VCM in the platform of theoperator's compartment 30 in relatively close proximity to where theoperator's seat 32 is located. According to one embodiment of thepresent invention, the VCM is located in the lower left hand corner ofthe platform of the operator's compartment 30 from the operator'sperspective when facing forward towards the forks 36.

The VCM receives the seat release command that has been broadcast acrossthe network 154 and then determines whether to ignore the command, or tohonor the request to release the operator's seat 32. As noted above, theVCM may selectively determine whether to release the operator's seat 32based upon messages from other modules on the network 154. Such messagesmay address vehicle physical conditions, e.g., vehicle speed, positionof the masts 26, 38, the forks 36 or any other condition that can becommunicated to the VCM. Additionally, the VCM (or other modules on thenetwork 154) may elect to temporarily disable working implements, e.g.,the load handling features of the vehicle, while the operator's seat 32is released, as noted above. For example, the VCM, or another module incommunication with the VCM, may disable the hydraulics including theforks 36, or other load handling features if the operator's seat 32 isnot in a locked position.

As seen in FIG. 6, the vertical frame member 72 of the intermediatemember 50 couples via the mounting member 74 to a seat base assembly 202that includes a bearing shaft 204 and a rotate assembly 206. As will beseen, the rotate assembly 206 may be rotated about the bearing shaft 204thus rotating the operator's seat 32. The seat base assembly 202 furtherincludes a mounting plate 208 that couples to the platform of theassembly 14 including the operator's compartment 30 via bolts 210.However, welds, fasteners or other securing methods may be used tosecure the mounting plate 208 to the platform assembly 14.

The rotate assembly 206 further includes a lock disk 212, which may beprovided as an integral part of the casting of the rotate assembly 206,or the lock disk 212 may be secured to the rotate assembly 206 by othersuitable means, e.g., welding, bolting, bonding or other securingmethods. The lock disk 212 includes a periphery 214 having one or morelocking positions, e.g., detents 216 provided along the periphery 214for providing the seat locking function as will be described in greaterdetail herein. The lock disk 212 thus defines one illustrative exampleof a component of the base member 110 discussed with reference to FIGS.3 and 4.

The operator's seat 32 need not be capable of rotating in a complete 360degree range of motion, although a complete 360 degrees of rotation iswithin the scope of the present invention (see FIG. 11). Rather, it maybe sufficient for the seat to be able to rotate at least through apredefined number of degrees of rotation as defined by the specificrequirements of the vehicle. For example, the seat base assembly 202 maybe configured to allow the operator's seat 32 to rotate between a rangeof approximately −20 degrees to +90 degrees with respect to apredetermined position. As such, the lock disk 212 (best seen in FIG. 8)comprises an arc of at least 110 degrees about the rotate assembly 206.Stops 218 project up from the mounting plate 208 positioned to cooperatewith the lock disk 212. The stops 218 serve to limit the rotation of thelock disk 212. Each stop 218 preferably includes a bumper 220, e.g., anelastomeric material such as rubber, that serves to absorb shock andreduce metal to metal noise as the operator's seat 32 is rotated to itslimits. The lock disk 212 may further include stop notches 222 in eachterminal end portion 224 for receiving the corresponding stop 218/bumper220 as the lock disk 212 is rotated to the corresponding limit oftravel.

Referring to FIGS. 6 and 7, to provide the locking function, a lockassembly 226 is operatively configured to selectively engage the lockdisk 212. As shown, the lock assembly 226 includes a lock device 228configured to selectively advance a plunger 230 that engages the lockdisk 212. When the plunger 230 is brought into engagement with a selectone of the detents 216 along the periphery 214 of the lock disk 212, theplunger 230 in cooperation with the lock disk 212 provides a lockingfeature by preventing the rotate assembly 206, and thus the operator'sseat 32, from freely rotating about the bearing shaft 204. Thus, thelock assembly 226 is one illustrative example of the release 108discussed with reference to FIGS. 3 and 4.

As best seen in FIG. 8, a first detent 216A of the detents 216 comprisesa first position provided along the periphery 214 of the lock disk 212,and is designated 0 degrees. The first detent 216A defines a generallyforward facing position for an operator sitting in the operator's seat32, i.e., facing the forks 36. A second detent 216B of the detents 216comprises a second position provided along the periphery 214 of the lockdisk 212 in a first direction from the first detent 216A. As shown inFIG. 8, the second detent 216B of the detents 216 is spacedapproximately 20 degrees from the first detent 216A (to the left) and isthus designated as a −20 degree position.

A third detent 216C of the detents 216 comprises a third positionprovided along the periphery 214 of the lock disk 212 in a seconddirection from the first detent 216A that is opposite from the firstdirection from the first detent 216A. The third detent 216C is spacedapproximately +60 degrees from the first detent 216A (to the right asshown) and is thus designated as a +60 degree position. Similarly, afourth detent 216D of the detents 216 comprises a fourth positionprovided along the periphery 214 of the lock disk 212 in the seconddirection from the first detent 216A. As shown in FIG. 8, the fourthdetent 216D is spaced approximately +90 degrees from the first detent216A (to the right) and is thus designated as a +90 degree position.

Although FIGS. 6-8 show the use of four detents 216, in practice, anysize and number of detents 216 may be arbitrarily provided. The size ofthe detents will depend on the structural requirements of the specificapplication. Moreover, the lock disk 212 can be adapted to allow 360degrees of rotation and/or continuous repositioning of the operator'sseat 32.

Referring back to FIGS. 6-8 generally, to support the lock assembly 226,a first lock support plate 232 extends from the mounting plate 208. Thefirst lock support plate 232 may define an extension that is part of thesame casting as the mounting plate 208. However, the first lock supportplate 232 may alternatively be secured, e.g., welded, bonded, bolted orotherwise fastened to the mounting plate 208. Still alternatively, thefirst lock support plate 232 may be positioned proximate to but separatefrom the mounting plate 208. A second lock support plate 234 ispositioned over, and coupled to the first lock support plate 232 usingan appropriate coupling arrangement. For example, as shown in FIGS. 6and 7, the first and second lock support plates 232, 234 each comprisefour flange portions 236, one of the flange portions 236 generally beinglocated at each of the four corner areas of the first and second locksupport plates 232, 234.

A bolt assembly 238 is provided to couple the second lock support plate234 to the first lock support plate 232 at each of the flange portions236. Each bolt assembly 238 includes a bolt 240, a first washer 242, afirst resilient mount 244, and a second resilient mount 246. The bolt240 passes through the first washer 242, the first resilient mount 244,an aperture in the corresponding flange portion 236 of the second lockmounting plate 234, the second resilient mount 246 and fastens into afemale threaded aperture in a flange portion 236 of the first locksupport plate 232. Alternatively, a nut or other suitable terminatingdevice may be used in conjunction with the bolt. Still further,alternative arrangements of resilient mounts and alternative fastenersmay be used.

The resilient mounts 244, 246 comprise an elastomeric material such asrubber or other flexible or deformable material(s). The resilient mounts244, 246 reduce noise when locking and unlocking the seat by providingshock absorption when the lock device 228 operates to engage and retractthe plunger 230 from the lock disk 212. Moreover, the resilient mounts244, 246 provide the ability to adjust the position of the lock device228, e.g., to account for tolerances in aligning the lock device 228with the lock disk 212. Still further, the resilient mounts 244, 246provide play in the lock assembly 226 that reduces the effects ofbinding of the plunger 230 in engagement with a corresponding one of thedetents 216 of the lock disk 212 when the lock device 228 releases theoperator's seat 32 for adjustment.

As shown in FIGS. 6 and 7, the lock device 228 comprises anelectro-mechanical device, e.g., a solenoid. A first support 250 isprovided for securing the stator assembly 252 of the solenoid to thesecond drive mounting plate 234. For example, as shown, the firstsupport 250 is integrally formed with the second lock support plate 234and comprises first and second projections 254, 256 for securing thesolenoid, such as by using bolts, etc. A shaft 264 of the solenoid thusdefines at least a component of the plunger 230. As best seen in FIG. 6,a biasing arrangement 260, e.g., a spring, is provided to urge theplunger 230 to an extended (locked) position such that the default stateof the lock assembly 226 is to lock the operator's seat 32 irrespectiveof whether there is power to the solenoid. Accordingly, as will bedescribed in greater detail below, power is applied to the solenoid toretract the plunger 230 to release the operator's seat 32 foradjustment. The solenoid is thus de-energized when the operator's seat32 is in a locked position. As shown in FIG. 7, in practice, thesolenoid shaft and bias arrangement 260 may be protected by a dust cover262 to prevent contaminants from interfering with the operation of thesolenoid.

As best seen in FIG. 7, the plunger 230 comprises an assembly thatincludes the solenoid shaft 264 and a shaft extension 266. One exemplaryway to couple the shaft 264 to the shaft extension 266 is to terminatethe shaft 264 in a two ear clevis 268 and terminate the shaft extensionin a single ear clevis 270. The single ear clevis 270 is insertedbetween the ears of the two ear clevis 268 and a dowel 273 or othersuitable locking device is passed through the ears of the clevis 268,270. The dowel 273 may be secured in position using a retainer 275,e.g., a cotter pin. Of course, other techniques such as the use of acollar, clamp, fitting, or other fastening or bonding arrangements mayalternatively be used to couple the shaft 264 to the shaft extension266. Still further, depending upon the application and componentselection, a shaft extension may not be required. Referring to FIGS. 6and 7 generally, the shaft extension 266 passes through a first bearing272, extends radially towards the lock disk 212 and passes through asecond bearing 274 that is positioned proximate to the rotate assembly206.

As noted above, when the solenoid is not energized, the plunger 230 isbiased toward the lock disk 212 via the spring 260. Accordingly,whenever the end of the plunger 230 is positioned opposite one of thedetents 216, i.e., when the plunger 230 is substantially in line with aselect detent 216, the plunger 230 is forced into the detent to lock theoperator's seat 32 into the corresponding locked position. When thesolenoid is energized, it operates to retract the plunger 230 so thatthe plunger 230 is not forced into one of the detents 216 on the lockdisk 212. It was further noted above that it is possible for binding tooccur when releasing the operator's seat 32. Binding may occur,especially when the operator's seat 32 is torqued, turned or otherwisetwisted when the operator actuates the seat release element 104. Assuch, the resilient mounts 244, 246 allow “play” in the positioning ofthe solenoid such that the force required to withdraw the solenoid isreduced. Further, the above-described swivel of the operator support 48with respect to the base structure 46 further reduces binding of thelock pin. However, it may be desirable to configure a relatively strongforce to withdraw the plunger 230 from the detents 216. A lesser amountof force may then be utilized to maintain the plunger 230 withdrawn fromthe lock disk 212 while the operator's seat 32 is being repositioned.

As shown, the solenoid is controlled via a pulse width modulation (PWM)controller 278. The PWM controller 278 may be integral with the secondmodule 156 or provided as a separate device which is controlled, atleast in part, by the second module 156. The PWM controller 278 isoperated such that a first PWM signal, e.g., one with a relativelyhigher duty cycle is used to withdraw the plunger 230 from the lock disk212 when a seat release command is initiated, and a second PWM signal,e.g., one with a relatively smaller duty cycle is used to maintain theplunger 230 withdrawn from the lock disk 212 while the operator's seat32 is being repositioned. By reducing the duty cycle of the PWM signalonce the plunger 230 has been withdrawn from the lock disk 212, lesspower is consumed in the time period while the vehicle operator isrepositioning the seat from a first locked position to a second lockedposition, which results in reduced heat build up and consequently,longer solenoid life.

A first detector 280 is operatively configured so as to detect when thelock device 228 is operated and the plunger 230 is extended to define alocked seat position. As an example, the first detector 280 may comprisea switch that is mounted so as to detect travel on either the shaft 264or the shaft extension 266. As shown, the first detector 280 comprises afirst contact switch that is mounted on top of the support structure forthe first bearing 272. The first contact switch makes or breaks anelectrical connection under the control of a first detecting surface282, e.g., a vertically extending plate coupled to the shaft extension266. The state of the first contact switch depends upon whether the seatis in a locked position or not. When the plunger 230 is locked into aselect one of the detents 216 of the lock disk 212, the first detectingsurface 282 is sufficiently close to the first contact switch to operateit. However, as the plunger 230 is retracted from a corresponding detent216, the first detecting surface 282 moves back with the shaft extension266 and is pulled sufficiently away from the first contact switch torelease it. The first detector 280 is not limited to the contactswitching arrangement shown. For example, other sensing arrangements canbe utilized to determine whether the plunger 230 is positioned withinany one of the detents 216 of the lock disk 212.

In the illustrative embodiment of FIGS. 6-8, the operator's seat 32 iscapable of rotating approximately 110 degrees, from a zero degreeposition defining a forward facing position, to 20 degrees in a firstdirection and 90 degrees in a second direction with respect to the zerodegree designated position. Assuming that there are four detents 216 inthe lock disk, e.g., −20, 0, +60 and +90 as described above, the firstdetector 280 will determine if the seat is locked in any one of the −20,0, +60 and +90 positions. However, it may further be desirable todetermine whether the operator's seat 32 is within a predetermined,limited range of its total allowed rotation, e.g., whether theoperator's seat 32 is generally forward facing, irrespective of whetherthe seat is locked into a given detent 216. If such a designconsideration occurs, a second detector 284 may be operatively arrangedso as to detect the presence of the operator's seat 32 in the designatedlimited range.

As shown, the second detector 284 comprises a first rotating member 286that is rotatably mounted to the top surface of the support structure ofthe second bearing 274. A second contact switch 288 is coupled to thefirst rotating member 286. The first rotating member 286 may bebeneficial where adjustments to the position of the second contactswitch 288 are required, such as to account for manufacturingtolerances, etc.

The second contact switch 288 is configured to detect the presence of acam 290 (seen in FIG. 6) that projects from the rotate assembly 206,just above the lock disk 212 as shown. The cam 290 is oriented withrespect to the lock disk 212 so as to define the desired range ofpositions to be detected. For example, assume that the cam 290 isconfigured to detect whether the operator's seat 32 is forward facing,thus the cam 290 is positioned in the vicinity of the designated 0degree detent 216. When the operator's seat 32 is rotated into a forwardfacing position defined within the range of the cam 290, the cam 290will operate the second contact switch 288 indicating that the generalforward facing position is achieved. If the cam 290 is rotated past thesecond contact switch 288, then the second contact switch 288 isreleased indicating that the seat is “someplace else”, i.e., not in therange of designated forward facing positions. As seen in FIG. 7 forexample, the seat is rotated past the forward facing position asevidenced by the observation that the cam 290 is not in position tooperate the second contact switch 288.

Referring briefly to FIG. 11, the drive assembly 226 may comprise otherdevices alternatively to a solenoid. For example, the drive assembly maycomprise a brake system as schematically represented. The drive assembly226 comprises a brake system that includes a braking device 295. Thebraking device engages the base member 110 to selectively lock andunlock the operator's seat from rotational positioning. Althoughschematically illustrated for purpose of simplifying the discussionherein, it is contemplated that any braking arrangement may be used. Forexample, the braking device may comprise calipers, pads or otherarrangements. Moreover, the braking device 295 may engageother/additional surface(s) of the base member 110 other than as shown.Further, as shown, the base member 110 includes a disk that allows acomplete 360 degrees rotation of the operator's seat if the specificapplication dictates a desire for a complete range of rotation. Whilenot shown for sake of simplifying the discussion herein, the brakearrangement of FIG. 11 can include one or more sensors as discussedabove with reference to FIGS. 6-8. Still further, other alternatives maybe used to implement the drive assembly 226, including for example,mechanical, electrical, electro-mechanical, pneumatic, hydraulic andother powered sources. The specific drive assembly 226 will likely bedetermined by the capabilities and features of the specific vehicle.

Referring back briefly to FIG. 2, as noted above, the operator's seat 32is provided with a sensor to determine whether an operator is seated.One exemplary way to detect the presence of an operator in theoperator's seat 32 is illustrated with respect to FIGS. 9 and 10 incombination with FIG. 2. FIG. 9 illustrates the operator's seat 32 withthe armrests 58, 60 and the lower half of the intermediate member 50removed for clarity. As noted with reference to FIG. 2, the seat base 52can be rotated to a “seat up” position according to the direction arrow62 as shown in FIG. 9, or rotated to a “seat down” position as shown inFIG. 2. Along the back end of the periphery of the seat base 52, a seatbottom frame member 302 is provided that cooperates with a third sensor314 to detect the presence of an operator.

Referring to FIG. 10, the seat bottom frame member 302 pivots with theseat base 52 such that when the seat base 52 is in the down position andan operator is seated, the seat bottom frame member 302 engages a lever304. The lever 304 is rotatable about a pivot pin 306 in response toengagement by the seat bottom frame member 302. The lever 304 comprisesa head portion 308 which is biased by a biasing member, e.g., by aspring 310 and spring support structure 312. The head portion 308 isfurther positioned proximate to a third detector, e.g., a third contactswitch 314. The third contact switch 314 may optionally be positioned ona block 316 or other, optionally adjustable support structure.

When the seat base 52 is in a down position and an operator is seated,the seat bottom frame member 302 of the seat base pushes against thelever 304 causing the lever 304 to rotate about the pivot pin 306 in aclockwise manner as shown. The clockwise rotation of the lever 304causes the biasing member to compress, which allows the head 308 of thelever 304 to operate the contact switch 314 indicating that an operatoris seated. If there is no operator in the seat, for example, when theoperator's seat 32 is in the up position shown in FIG. 9 or in the downposition of FIG. 2, the biasing member rotates the lever 304counterclockwise so that the head portion 308 of the lever 304 allowsthe contact switch 314 to release thus designating that the operator isnot seated. The status of the contact switch 314 may be communicated toa module, e.g., the module 152 shown in FIG. 2, and be broadcast to thesecond module 156, e.g., the VCM module, or alternatively, the thirdswitch 314 may be hardwired directly to the VCM, i.e., the second module156, or to any other module 152, 158, 160, 162, etc.

Having described the invention in detail and by reference to preferredembodiments thereof, it will be apparent that modifications andvariations are possible without departing from the scope of theinvention defined in the appended claims.

1. A system for repositioning an operator's seat in a vehiclecomprising: an operator's seat having: a base structure; and an operatorsupport coupled to said base structure, said operator support includinga seat bottom upon which a vehicle operator may sit; a rotate assemblyarranged such that said base structure is rotatable relative to a floorof said vehicle; a seat release control coupled to said operator's seat;and a release assembly having a lock device that engages said rotateassembly to lock said operator's seat from rotating, said seat releasecontrol and said release assembly being electrically coupled, whereinsaid lock device is electrically disengaged from said rotate assembly inresponse to operation of said seat release control and releases saidrotate assembly allowing rotation of said operator's seat by anoperator.
 2. The system according to claim 1, wherein: said rotateassembly comprises a lock disk having a plurality of locking positionsthereon; and said lock device locks said operator's seat from rotationwhen said operator's seat is rotated so as to bring a select one of saidlocking positions substantially in line with said lock device and saidseat release control is not activated.
 3. The system according to claim2, wherein said rotate assembly further comprises at least one stop thatlimits the range of rotation of said operator's seat when saidoperator's seat is released for repositioning.
 4. The system accordingto claim 1, wherein said operator's seat may rotate 360 degrees whensaid release assembly is released from engagement with said lock device.5. The system according to claim 1, wherein said lock device comprises asolenoid.
 6. The system according to claim 5, wherein said rotateassembly comprises a lock disk having a plurality of locking positionsthereon, and said solenoid comprises a plunger that is operativelycontrolled to lock said operator's seat by projecting into a select oneof said locking positions on said lock disk.
 7. The system according toclaim 6, wherein said plunger is extended to lock said operator's seatwhen said solenoid is not energized, and said plunger retracts torelease said operator's seat when said solenoid is energized uponoperation of said seat release control.
 8. The system according to claim6, wherein: said solenoid is controlled by a first duty cycle pulsewidth modulation signal when retracting said plunger from said rotateassembly and said solenoid is controlled to retain said plunger in aretracted position while said operator's seat is being repositioned by asecond duty cycle pulse width modulation signal.
 9. The system accordingto claim 6, wherein said plunger comprises a solenoid shaft coupled to ashaft extension, said shaft extension guided by bearings towards saidlock disk of said rotate assembly.
 10. The system according to claim 5,wherein said release assembly further comprises a support plate that iscoupled to said rotate assembly by resilient mounts configured to allowplay between a plunger of said solenoid and said rotate assembly. 11.The system according to claim 1, wherein: said operator's seat furthercomprises an armrest; said armrest supporting a control handle having atleast one control element; and said seat release control is positionedon said control handle.
 12. A system for repositioning an operator'sseat in a vehicle comprising: an operator's seat having: a basestructure; and an operator support coupled to said base structure, saidoperator support including a seat bottom upon which a vehicle operatormay sit; a rotate assembly arranged such that said base structure isrotatable relative to a floor of said vehicle; a seat release controlcoupled to said operator's seat; a release assembly having a lock devicethat engages said rotate assembly to lock said operator's seat fromrotating, wherein said lock device is electrically controlled inresponse to operation of said seat release control to release saidrotate assembly for rotation of said operator's seat by an operator; afirst detector configured to detect whether said operator's seat islocked or unlocked for repositioning by said operator; a cam operativelyconfigured to designate a limited range of positions of said operator'sseat, a second detector configured to detect whether said cam is withinsaid designated range of positions; and a third detector configured todetect whether an operator is seated on said seat bottom, wherein: saidfirst, second and third detectors are coupled to a controller forcontrolling at least one function of said vehicle.
 13. The systemaccording to claim 1, wherein said lock device comprises a brakingdevice configured such that said operator's seat can be selectivelylocked into any rotated position.
 14. A system for repositioning anoperator's seat in a vehicle comprising: an operator's seat having: abase structure; and an operator support coupled to said base structure,said operator support including a seat bottom upon which a vehicleoperator may sit; a rotate assembly arranged such that said basestructure is rotatable relative to a floor of said vehicle; a seatrelease control on a control handle, said control handle including atleast one additional control element that provides at least one othervehicle control function; and a release assembly having a lock devicethat engages said rotate assembly to lock said operator's seat fromrotating, said seat release control and said release assembly beingelectrically coupled, wherein said lock device is electricallydisengaged from said rotate assembly in response to operation of saidseat release control and releases said rotate assembly allowing rotationof said operator's seat by an operator.
 15. The system according toclaim 14, further comprising: a first detector configured to detectwhether said operator's seat is locked or unlocked for repositioning bysaid operator; a cam operatively configured to designate a limited rangeof positions of said operator's seat, a second detector configured todetect whether said cam is within said designated range of positions;and a third detector configured to detect whether an operator is seatedon said seat bottom, wherein: said first, second and third detectors arecoupled to a controller for controlling at least one function saidvehicle such that control of said at least one function is affected by astate of at least one of said first, second and third detectors.
 16. Thesystem according to claim 14, wherein said control handle is provided onan armrest of said operator's seat.
 17. The system according to claim16, wherein: said seat release control is provided above a horizontalplane of said armrest of said operator support, wherein said seatrelease control is operative simultaneously with at least one additionalcontrol element on said control handle while said operator is operatingsaid vehicle.
 18. A system for repositioning an operator's seat in avehicle comprising: an operator's seat having: a base structure; and anoperator support coupled to said base structure, said operator supportincluding a seat bottom upon which a vehicle operator may sit; a rotateassembly arranged such that said base structure is rotatable relative toa floor of said vehicle; a release assembly operatively configured tolock said operator's seat from rotating when said release assembly is inengagement with said rotate assembly, and to allow said operator's seatto rotate when said release assembly is released from engagement withsaid rotate assembly; a seat release control on a control handle,wherein said seat release control is operable to cause said releaseassembly to release said operator's seat for repositioning and saidcontrol handle includes at least one additional control element thatprovides at least one other vehicle control function; and a firstdetector configured to detect whether said operator's seat is locked orunlocked for repositioning by said operator; a cam operativelyconfigured to designate a limited range of positions of said operator'sseat, a second detector configured to detect whether said cam is withinsaid designated range of positions; and a third detector configured todetect whether an operator is seated on said seat bottom, wherein: saidfirst, second and third detectors are coupled to a controller forcontrolling at least one function said vehicle such that control of saidat least one function is affected by a state of at least one of saidfirst, second and third detectors.
 19. The system according to claim 14,further comprising a controller coupled to said release assembly, saidcontroller disabling said lock device from releasing with said rotateassembly based upon a predetermined state of said vehicle.
 20. Thesystem according to claim 1, further comprising: a first detectorconfigured to detect whether said operator's seat is locked or unlockedfor repositioning by said operator; a cam operatively configured todesignate a limited range of positions of said operator's seat, a seconddetector configured to detect whether said cam is within said designatedrange of positions; and a third detector configured to detect whether anoperator is seated on said seat bottom, wherein: said first, second andthird detectors are coupled to a controller for controlling at least onefunction of said vehicle.